Guarana

This week was finals week at most US colleges, so I am saluting our burned out students with a post about Energy drinks. These have been very popular for the past few years, offering a burst of sugar, caffeine, and magical herbal substances including Guarana. The main chemical ingredient in Guarana is caffeine. It also contains some antioxidants and theobromine (of chocolate fame) and theophylline which are heart stimulants.

In South America, the Guarana plant has been used for centuries as a stimulant and memory enhancer. No wonder students drink the stuff.

According to tropical lore, the berries from the Guarana plant are processed and dried and then pounded into a dry powder. The powder is added to water and a dough results which is rolled out into small cylinders. It is known as Brazilian coke. It is used by grating into a beverage and sweetened to taste. It is more popular in Brazil than cola drinks. It is so widely known that the word for soda is often “Guarana” regardless of the flavor of the beverage. The most popular brand is the Antarctica soft drink. More caffeine is consumed in South America from guarana than from coffee and colas combined.

There is some evidence to suggest Guarna has some health effects. In the ‘Pharmacological Activity of Guarana (Paullinia cupana) in laboratory Animals’ by Espinola, E.B. Dias RF et al J. Ethnopharmcol 55 (3); 223-9, it increased memory and endurance when compared to a placebo in rats.

In humans, memory, alertness and mood were increased by moderate doses. It is also generally recognised as safe by the US government. Since the main effects seem to be from the caffeine, I cannot say whether it would do much more than a cup or two of coffee, but whatever floats your boat. The main thing that will help you do better on exams is more studying. If a soft drink with mystical powers is your drug of choice, it may allow you to study more. I would think unstimulated study sessions and a good night’s sleep would be the best, but I am just a Mom, not a brain scientist. Good luck, kids.

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